Telephone-transmitter.



A. I). JONES. I TELEPHONE TRANSMITTER. APPLICATION mam MAY 1, 1m.

Patented Nov. 24, 1914.

invention; l ig. 2

movabl ALVA D. J ONE-15?.

0F PHILADELPHIA, PENNSYLVANIA.

Specification of Letters Patent.

Application filed May 7, 1914. Serial No. 837,031.

To all whom it may concern I Be it known that I, ALVA D. Jones, arcitizen of the United States, residing in Philadelphia, Pennsylvania, have ,invented certain Improyements in Telephone-Transmitters, of which the following is a specification. I

One object of my invention is to provide a telephone transmittcr which While being primarily designed to give the most perfect results as a sound receiving}; and transmitting instrmnent, shall nt'the same time be of the utmost simplicity of construction, its parts being few in number, substantial, durable and comparatively inexpensive. I also desire to provide a transmitter Whose con struction shall be such as to revent paclc ing of the carbon granules i its resistance cell and which shall transmit the sounds pro .duced by the human voice without an accomanying blare or noise due to'its bodily viration or other causes. v

A further object of the invention is to provide a transmitter which in addition to the above noted characteristics shall be so made thatits parts may be assembled in a minimum ot' time, while the complete instru ment shall-be of such design as to practically eliminate the possibility of its getting out of order even after the lapse of long periods of time' These objects and other advantageous ends I secure as hereinafter set forth, referonce being bad to the accompanying drawings, in which; A

Figure 1 is a side elevation partly in section, illustrating the preferred form of my I is a front elevation of part of a telephone transmitter, the face-plate and diaphragm being removed; Fig. 3 is a plan, artly in section, further illustratin the construction of the transmitter; Fig. is a perspective of the resilient supporting member; Fig. 5 is a vertical section of a slightly modified form of the invention, and Fig. 6 is a section, on a greatlyenlarged scale, illustrating a detail of my invention. In the above drawings, 1 represents the upper part of the supporting standard ofa telephone transmitter within which is pivotally mounted a hook 2 normally supporting the receiver 3.

On the upper part of the standard 1 is y mounteda hollow metallic she" 4 having 'removably fixed to it a face-plate 5 carrying a mouth-piece 6 of the standard its rear portion remainder is relatively rigid, it is construction, the shell being connected to the standard 1 by a horizontal pivot 7. Within the shell is mounted apody or solid mass 8 of resilient material such as rubber,

either soft or partly or wholly vulcanized,

the same. being preferablv of such form that closely fits the rear part of the shell 4 and has, an opening for the pussage of the pivot pin 7.. of the resilient body is substantially circular in elevation, and the edge of its main por tion is connected to a relatively thick ring 9 of substantially circular section through a comparatively thin neck portion 10, the construction being such that the plane of the front edge of the ring portion is spaced away from the plane of the relatively flat front face of the body. This latter is provided with a substantiallycylindrical central recess 11 in which is mounted a resistance cell 12 of standard construction, there being a rearward extension or post 13 from said cell, cemented or otherwise fixed within a cavity in the body of the resilient mass 8. A rod or post 14 projecting ironrthe front face of the resistance cell is connected tola diaphragm 15 of the customary form whose outcredgcs are clamped so as to form an airtight joint between the ring portion 9 of the resilient member 8 and the face-plate 5 which is customarily held to the shell 4; by screws 16, there being provided the customary gaskets 17 between the diaphragm, the member 8, and the face-plate.

' As shown in Fig. 6, the outer or front end of the post 14. is threaded so that it ma pass loosely through the center of the diaphragm 15 but an airtight joint or connection is made between these two parts by a body 20 of wax or other suitable sealing materiah'nnd thereafter the jam nuts 21 are placed on the post so that the inner one engages said sealing bod While I preferably only partially vulcanize the nee: and ring portions 10 and 9 of the resilient body 8, so that they are relatively springy while the base forming the to be understood that said member may be wholly vulcanized or, in some instances, may be made of unvulcanized material, and while I preferably employ rubber, it is to be noted that other materials having more or less strongly marked resilient qualities may be substituted without departing from my in" vention.

Patented Nov. 24, 19th The front portion- Cir ' that an instrument the part 18 which The customary electrical connections are made to the terminals formed by the stem 13 and the rod i l of: the resistance cell led into the standard-*1 through a which is hermetically sealed in any manner.

By. practical. experiment, I have found constructed as above gives an unusually satisfactory and clear transmission of sounds without any of the undesirable and annoying vibrations which are customarily present.

Not only is the instrument extremely simple in construlion, but it may be assembled with the utmost ease and speed and ob viously the possibility of it becoming injured by long continued use, or even careless handling, is reduced to a minimum.

While, entire mass of the member 8 of resilient material, with its neck and ring portions more resilient than the remainder, l. may in some cases construct it shown in 5, so that L extends into the rear of the shell 4 is in the form of abody of metal havii'ig a rectangular section, While the rubher or other resilient body El is littedm' rcast around. this part to which itmay be additionally attached in any desired. manner;

it is to be noted. that makes airtighteontact with the part 9 on passage suitable WhlCl'l it is mounted and.that the openings into the chamber containing the resistance cell l2 are sealed so that the latter is eli'ectually prevented from packing or other injury by dampness.

While I have illustrated and included in the claims an element described as a resistance cell, 7 this termrel'erence is bad to that portion of the transmitter Whose electrical functions or qualities are afi'ected by the diaphragm in such manner as to cause variations of the current flow in the circuit or" which it forms a part.

- lit is to be understood that the relatively thin neck 10 by virtue of its proportions as Well as because of its material, provides a yieldingsupport for the peripheral part 9 and may in itself constitute the sole resilient supporting means for said part and the diaphragm 15, especially if the body 8 and the ring 9 are made of relatively unyielding material.

ll found advisable to reinforce the rubber orother material forming the body 8 or 8% l may cast the latter around a perforated ring or plate 22 preferably flanged and made of spring metal extending through the neck 10 into the ring; 9 and either engaging or approaching more or less closely the lug l8 inv that form or the invention ll cla1m:- pl. "lihe combination in a telephone transshown in 5..

and are between a portion of the as above noted, I prefer to make the the diaphragm 15 thin yielding neck it is to be understood that by 'tions of different resiliency;

structure; a solid ilac so mass or material tween the diaphragm and a portion of said I mass of material Whose resiliency is different :Erom that engaged by the diaphragm.

2. The combination in a telephone transmitter,

a casing inclosing the same; a diaphragm confined casing and the relatively resilient port-ion of said mass of material; and a resistance cell mounted between the diaphragm and the relatively rigid pertion or the mass.

3. The combination in a telephone transmitter or a body of resilient material having a central cavity a resistance cell mounted in said cavity and rigidly connected to said body of material; with. a diaphragm operatively connected to said cell and sup ported at its periphery on said body of resilient material.

4-. The combustion in a telephone transmitter of a casing; a mass oi relatively resilient material including a. peripheral portion connected to the body by a relatively portion; a diaphragm clamped against said peripheral portion; and a resistance cell operatively connected to the diaphragm.

The combination in a telephone transmitter of a casing; a mass of rubber mounted therein and including a convex peripheral portion; a diaphragm clamped against said peripheral portion; "with a resistance cell mounted within and directly connected to the body of said rubber mass and means for operatively connecting said cell to the diaphragm.

6. The combination in a telephone transmitter, of a body of *material having porhaving its periphery in airstight engagement With one portion of said body of ma terial; With a resistance cell hermetically sealed Within a cavity of said body, and connected between the diaphragm and a portion of the body having -a resiliency dill'erent from that or the part engaged by the diaphragm.

7. The combination in a telephone transmitter, of arsuppcrting structure having an integral yieldingly mounted peripheral portion;v a diaphragm clamped against said portion; and a resistance cell eperatively connected between the diaphragm and a rela tively rigid port-ion or the supporting structure.

8. The oombinationin a telephone trans nutter of a supporting structure; a body of resilient material mounted thereon and including relatively thin neck portion an or a mass of material having relatively resilient and rigid portions;

a diaphragm a ring carried thereby; a reinforcing structure extending from the body through the neck into the ringportion; a diaphragm engaging said, body; and a resistance cell operatively connected to said diaphragm.

9. The combination in a telephone transmitter of a supporting structure; a body of rubber having relatively rigid and resilient portions of which the first is connected to the supporting structure; a diaphragm mounted on the "esilient portion; and a resistance cell mounted between the rigid portion and the diaphragm.

1.0. The combination in a telephone transmitter of a casing a single structure therein having relatively rigid portion connected to said casing and including a relatively resilient portion; a diaphragm; and a resistance cell connected between said diaphragm and the rigid portion.

11. The combination in a telephone transmitter of: a casing having a hollow extension forming a hinge member for cooperation with a supporting standard; a structure having a relatively rigid portion extending into the hollow of said extension and mcluding an annular resilient portion; a diaphragm mounted on said latter portion; and a resistance cell in operative connection with the diaphragi 12. The combination in a telephone transmitter, of a casing; a diaphragm; a resistance cell; and a structure having a rigid portion connected to the casing and supporting the resistance cell; said structure includ-' ing an integral relatively resilient portion supporting the diaphragm.

13. The combination in a telephone transmitter, of a casing; a body of rubber therein having rigid and resilient portions of which the former is connected to the casing and the latter is annular in form; a diaphragm mounted on the resilient portion; and a resistance cell connected between the diaphragm and the rigid portion of said rubber body.

1 1-. The combination in a telephone transmitter of a body of resilient material having a central cavity; a resistance cell mounted in said cavity and rigidly connected directly to said bodycf material at the bottom of the cavity; with a diaphragm operatively connected to said cell and supported at its eriphery on said body of resilient material.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALVA D. JONES.

Witnesses:

WILLIAM E. BRADLEY, WM. A. BARR. 

